Green Laser Diode is one package type of semiconductor lasers. The green laser diode exist in regular cheap laser pointer pens, and it also exists in solid state laser system as following. You can buy the green laser diodes here at Dioded Inc Store.
There are many kinds of green laser diodes: 515nm green laser diodes, 520nm green laser diodes. The 532nm green laser diodes are different to other green laser diodes.